1. Center for Influenza and Respiratory Virus Research, National Institute of Infectious Diseases, Japan
2. Hyogo Prefectural Institute of Public Health Science, Japan
3. Virus group, Division of Infectious Animal Disease Research, National Institute of Animal Health, National Agriculture and Food Research Organization, Japan
4. Emerging Virus Group, Division of Zoonosis Research, National Institute of Animal Health, National Agriculture and Food Research Organization, Japan
5. Animal Quarantine Service, Ministry of Agriculture, Forestry and Fisheries, Japan